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Aqueous Surface Chemistry and Corrosion of Minerals

Published online by Cambridge University Press:  29 November 2013

W.H. Casey ,
C. Eggleston ,
P.A. Johnsson ,
H.R. Westrich  and
M.F. Hochella Jr.
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Extract

Nature is generous with complexity. The number of thermodynamic variables necessary to describe even simple stream chemistry can easily number to a hundred. Nevertheless, research on Earth materials remains exciting because of the vastness of geologic time and the huge scale of global processes. For example, even simple ion-exchange experiments have profound implications when considered in the context of global cycling of elements. Sodium exchange from seawater onto the 1.83 × 1016 g of river-borne clays removes 20–30% of the yearly sodium addition to the ocean. Research on Earth materials, although complex, is rewarding through the scale of the potential result.

The surface chemistry of minerals is important for understanding natural mineral transformations and also because surface reactions help control the migration and degradation rates of pollutants in natural waters. These pollutants range from organic herbicides and pesticides, which leak past reactive soil horizons into groundwaters, to acid rain and heavy-metal leaching from mine tailings, sewage sludge, or coal fly ash. The importance of characterizing mineral surface chemistry is clear when one considers that 0.5 to 2% of usable groundwater in the United States is thought to be contaminated.

This article reviews some simple surface chemistry of oxide and silicate minerals in water. We focus on the kinetics of mineral corrosion because this subject is interesting to both geochemists and materials scientists. The surface properties that make some solid oxides relatively inert to acid corrosion, for example, are also manifested in the rates of natural mineral weathering.

Type
Earth Materials
Information
MRS Bulletin , Volume 17 , Issue 5 , May 1992 , pp. 23 - 29
Copyright
Copyright © Materials Research Society 1992

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